pp3 2题目

liming21

pp3 2题目

in the xy-coordinate plane, line l and line k intersent at the point(4,3), is the product of their slopes negative?

(1) the product of the x-intercepts of line l and k is positive
(2) the product of the y-intercepts of line 1 and k is negative

Quantity:
1, the rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reation rate unchanged?
50% decrease
40% decrease
40% Increase
50% increase

jack00000

X=A^2/B*K B->2B A->40%

jack00000

第一题画图就行了