Which of the following has a graph that is a straight line?

a. equation 1: y = 4x3 + 6

b. equation 2: y = 5x − 4.5

c. equation 3: y2 = x − 1

d. equation 4: y = 2x2 + 6

For the equations below which statement is true ? -2x=14 6x=-42

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest